Yes, I really am this nerdy

The meme is:Grab the book nearest you. Right now.Turn to page 56.Find the fifth sentence.Post that sentence along with these instructions on your LJ.Don't dig for your favorite book, the coolest, the most intellectual. Use the CLOSEST.

Honest to god, this is the book that was closest to me at the time:

Equation (11) can easily be proved by induction on n, but it is interesting to see how it can also be derived from Eq. (1) with two applications of Eq. (6):